invoke

I've seen the common setup for cross threading access to a GUI control, such as discussed here: Shortest way to write a thread-safe access method to a windows forms control All the web hits I found describe a similar thing. However, why do we need to check InvokeRequired? Can't we just call Invoke directly? I assume the answer is no, so my real question is 'why'? From non-UI threads we can't touch the UI - very bad things can happen, since controls have thread affinity. So from a non-UI thread we must (at a minumum) call Invoke or BeginInvoke . For UI-threads, however - we don't want to call

Is there a way to Invoke an overloaded method using reflection in .NET (2.0). I have an application that dynamically instantiates classes that have been derived from a common base class. For compatibility purposes, this base class contains 2 methods of the same name, one with parameters, and one without. I need to call the parameterless method via the Invoke method. Right now, all I get is an error telling me that I'm trying to call an ambiguous method. Yes, I could just cast the object as an instance of my base class and call the method I need. Eventually that will happen, but right now,

I've seen a ton of post regarding the problem of control.Invoke hanging applications but they mostly seemed to be restricted to those running on .NET 1.1. I've also seen suggestions to use .BeginInvoke instead which I have tried but to no avail. .BeginInvoke doesn't hang but it also doesn't call the delegate. My main concern is that I have used .Invoke for years with no issues and I have a major application in the field that uses it extensively and I'm worried that this problem will crop up there. I am doing nothing differently as far as I can tell between my working code and the code that

I am unable to access the UNC paths on my servers in a Powershell remote session from my local machine. I am able to use them from Servers Cmd prompt directly. Actually, I have logged into the server and mapped a UNC path as local drive (say X:). Used Reconnect on Login option. I have a batch file which resides in this X: drive, I want to run it remotely using invoke command from my local script. But, it fails. It says "Cannot find drive. A drive with name X doesn't exist". Also, when I try to map drive using net use command in the scriptblock then also it throws an error - System error 1223 -

I've this little method which is supposed to be thread safe. Everything works till i want it to have return value instead of void. How do i get the return value when BeginInvoke is called? public static string readControlText(Control varControl) { if (varControl.InvokeRequired) { varControl.BeginInvoke(new MethodInvoker(() => readControlText(varControl))); } else { string varText = varControl.Text; return varText; } } Edit: I guess having BeginInvoke is not nessecary in this case as i need value from GUI before the thread can continue. So using Invoke is good as well. Just no clue how to use

I know that when manipulating UI controls from any non-UI thread, you must marshal your calls to the UI thread to avoid issues. The general consensus is that you should use test InvokeRequired, and if true, use .Invoke to perform the marshaling. This leads to a lot of code that looks like this: private void UpdateSummary(string text) { if (this.InvokeRequired) { this.Invoke(new Action(() => UpdateSummary(text))); } else { summary.Text = text; } } My question is this: can I leave out the InvokeRequired test and just call Invoke, like so: private void UpdateSummary(string text) { this.Invoke(new